Both Jeopardy! and Wheel of Fortune began broadcasting in high definition television.

Merv Griffin died of prostate cancer on August 12, 2007, at the age of 82. He created two game shows, such as Jeopardy! in 1964, and its sister show Wheel of Fortune in 1975. KingWorld is shut down on August 20, 2007.

This is the last season to be produced by KingWorld, due to KingWorld becoming CBS Television Distribution in the next season.

The opening credits have changed to a blue starry background, where many photographs are seen throughout before the Jeopardy! logo came into view. When Johnny Gilbert said "This is Jeopardy!", the Jeopardy! logo came into view, and is set on a starry blue and orange background with a grid pattern, with the Jeopardy! logo in blue. Finally, the Jeopardy! logo then zooms forward, in which the "A" reveals the 2002-2009 set.

The gameplay round, and Daily Double title cards changed its color to a starry blue background with the text appearing in orange.

The contestant intros and Final Jeopardy! winnings strip change its color to black with white borders and uses Franklin Gothic.

Korinna is not used on video clues, as well as in the Final Jeopardy! segments; these are changed back to CG Omega, and continued to use that font to this day.

The position labels in the closing credits, as well as the copyright notice and the "Created by Merv Griffin" text, have their strips removed, and all credits from Harry Friedman's credit to Bob Sofia's credit have their font changed to Helvetica, when Bob Sofia became associate producer.

Starting with this season, Johnny Gilbert was credited as the announcer in the closing credits.

The set receives a few minor facelifts to accommodate the transition to HDTV:

New contestant podiums were added to the set.

The contestant podiums were spaced wider apart so that a camera shot can be trained on a single contestant within a 16:9 ratio frame without showing the other contestants on the sides of the screen.

The game board has changed to a nearly seamless projection wall.

Also, during the first two weeks of taping, the ring-in lights on the contestant lecterns are in red LED. But due to visibility issues (especially on SD), the contestant ring-in lights were changed back to white from the third week of this season until the end of this set's run.

In the first full closing credit roll episode of the season, the split-screen background changed to a blue starfield with light blue bars, one on the top and one on the bottom, with the Sony Pictures Studios credit scrolling to an end on the center-right, and then, it zooms back in to fill the screen.

On later full credit rolls of this season, the Sony Pictures Studios credit fades in at the center-right.

The last KingWorld logo from 2006 before KingWorld shuts down to become CBS Television Distribution.

The last KingWorld logo first appeared on the December 25, 2006 Christmas-themed episode, before KingWorld shuts down. In this version, the 1998-2006 logo graphic was remade in 3D with silver trim in the background, the logo text was tilted, and the sky in the background was changed from golden brown to blue and white.

The last KingWorld logo did not begin using by Jeopardy! until the December 25, 2006 Christmas-themed episode.

This season:

Season 23 of Jeopardy! kicks off on September 11, 2006.

On the September 22, 2006, episode, the real 5,000th episode aired on this date.

On the September 25, 2006, episode, the red ring-in lights on the contestant lecterns changed its color to white as they were in the pre-high definition television version of the set due to visibility issues, particularly in standard definition television.

The Celebrity Jeopardy! tournament is taped at Radio City Music Hall and was aired from November 8, 2006 to November 21, 2006.

On later episodes of this season, the photograph of the Sphinx is changed to a photograph of the Coliseum in Rome, and the unknown statue is changed to a photograph of the Eiffel Tower in Paris, France; the elephant and Kremlin photographs were changed to photographs of a tiger, and Stonehenge, respectively; the Kremlin photograph removed the Mount Rushmore photograph, and the volcano photograph is changed to a photograph of a blue butterfly on a green leaf; the Great Wall of China removed the Mona Lisa photograph's former position, and the panda photograph is changed to an orangutan; and finally, the photograph of Martin Luther King, Jr. is changed to a photograph of Albert Einstein.

On this episode, which aired on March 16, 2007, the first-ever three-way tie for first place occurs with all three contestants winning $16,000.

This was the first time, in which two contestants on one previous episode on the April 17, 2006 episode, but returned due to technical difficulties; Brian Lamb returned on the June 26, 2007 episode, and lost a game, and Holly Owens came back on the July 3, 2007 episode and won two games.

This is the first of only two season to have two Teen Tournaments.

From October 2-6, 2006, Back To School week is held for the last time, where the kids from the 2006-07 school year start school on August 28, 2006, school closes out on June 1, 2007.

On the October 5, 2006 episode during Back to School Week, two middle-aged boys and one middle-aged girl play.

On the October 17, 2006 episode, three males play for the first time this season, this is the first all-male game since June 16, 2006.

On the October 23, 2006 episode, three males play for the second time this season.

On the October 26, 2006 episode, there are two male contestants and one female contestant.

On the October 27, 2006 episode, there are two female contestants and one male contestant.

On the October 30, 2006 episode, there are two female contestants and one male contestant.

On the November 6, 2006 episode, three males play for the third time this season.

On the November 30, 2006 episode, there are two female contestants and one male contestant.

On the December 1, 2006 episode, there are two male contestants and one female contestant.

On the November 14, 16 and 20, 2006 episodes during Celebrity Week, two male celebrities and one female celebrity play three times in a row.

On the November 15 and 17, 2006 episodes during Celebrity Week, three male celebrities play twice in a row, this is the fourth and fifth times this season that three males play.

On the December 5, 2006 episode, there are two female contestants and one male contestant.

On the December 6, 2006 episode, there are two male contestants and one female contestant.

On the December 20 and 22, 2006 episodes, there are two female contestants and one male contestant, this is the first time this season that a male champion plays against two female challengers twice in a row.

On the December 25, 2006 Christmas-themed episode, three males play for the sixth time this season.

On the January 8 and 9, 2007 episodes, three males play for the thirteenth and fourteenth times this season, this is the first time this season that three males play twice in a row.

On the January 11, 2007 episode, there are two female contestants and one male contestant.

On the January 15, 2007 episode, there are two male contestants and one female contestant.

On the January 17, 2007 episode, three males play for the seventh time this season.

On the January 18, 2007 episode, there are two female contestants and one male contestant.

On the January 19, 2007 episode, there are two male contestants and one female contestant.

On the January 22, 2007 episode, three females play for the first time this season, this is the first all-female game since July 24, 2006.

On the January 24, 2007 episode, there are two female contestants and one male contestant.

On the January 26, 2007 episode, there are two male contestants and one female contestant.

On the February 1, 2007 episode, three males play for the eighth time this seaon.

On the February 2, 2007 episode, there are two female contestants and one male contestant.

On the February 26, 2007 episode, three males play for the ninth time this season.

On the March 16, 2007 episode, three males play for the tenth time this season, the first ever three-way-tie occurs with the guys all winning $16,000.

On the March 19, 2007 episode, three males come back and play again for the eleventh time this season.

On the March 22, 2007 episode, there are two female contestants and one male contestant.

On the March 30, 2007 episode, three males play for the twelfth time this season.

On the April 20, 2007 episode, there are two female contestants and one male contestant.

On the April 25, 2007 episode, three females play for the second time this season.

On the May 17, 2007 episode, there are two female contestants and one male contestant.

On the May 18, 2007 episode, there are two male contestants and one female contestant.

On the June 1, 2007 episode, there are two female contestants and one male contestant.

On the June 7, 2007 episode, three females play for the third time this season.

On the June 14, 2007 episode, there are two female contestants and one male contestant.

On the June 15, 2007 episode, three males play for the fifteenth time this season, 15 is the new record holder of most times three guys played on Jeopardy!.

On the June 27, 2007 episode, there are two male contestants and one female contestant.

On the June 28, 2007 episode, three females play for the fourth time this season.

On the July 6, 2007 episode, there are two female contestants and one male contestant.

On the July 12, 2007 episode, there are two female contestants and one male contestant.

Season 23 of Jeopardy! wraps up on July 27, 2007.

Summer reruns air from July 30-September 7, 2007 with replacement fee plugs. Reruns later air on weekends from 2007-2008. On most of those reruns, the CBS Television Distribution logo replaces the KingWorld logo.